[Sbs] SBS GEp Abstract for APS DNP in October in N.N. - version 2
Evaristo Cisbani
evaristo.cisbani at iss.infn.it
Fri Jun 28 17:12:21 EDT 2013
Dear All,
attached the second draft of the abstract that takes into account
corrections and suggestions from Charles, Seamus, Brian and Mahbub; the
new version has <1300 chars.
Additional comments are welcome.
Thanks in advance
Best,
Evaristo
--
Evaristo Cisbani office : +39 06 4990 2847
Istituto Superiore di Sanita` lab : +39 06 4990 2347
Department of Technology and Health fax : +39 06 4990 2137
and Istituto Nazionale di Fisica Nucleare Roma - gruppo Sanita`
via Regina Elena 299 - 00161 Rome web : www.iss.infn.it/cisbani
Italy
------------------------------------------------------------------------
-------------- next part --------------
Title: Large acceptance magnetic spectrometer for the 12 GeV2 GEp experiment
Authors: @@@ GEp spokespeople ? suggestion very welcome @@@
GEp5 is the latest of a series of successful JLab experiments
that have measured a linear decrease of the electromagnetic proton form factor ratio GE/GM
with Q2, changing our view of the mechanism of the electron scattering.
GEp5 will extend the previous GE/GM measurements to higher Q2 where a possible
deviations from linearity could be expected; data can be compared with expectations
from perturbative QCD and can give new hints on the role of
quark orbital angular momentum.
To compensate for the large drop of the elastic cross section with Q2,
GEp5 needs to run at the highest beam polarization and luminosity,
with large acceptance detectors and a high efficiency proton polarimeter.
These requirements are fulfilled by the development of a new liquid hydrogen target and
the new Super Bigbite Spectrometer (SBS).
SBS will use a conventional setup with state of the art detectors:
an existing dipole magnet (field integral $\le 2$ Tm)
will be properly adapted to reach forward scattering angles;
large Gaseous Electron Multiplier (GEM) chambers
will be used as trackers for both the primary proton and the scattered secondary in the polarimeter.
A new shashlik calorimeter with high segmentation will likely complete the detector setup.
Details will be presented at the meeting.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/x-pkcs7-signature
Size: 2875 bytes
Desc: not available
Url : https://mailman.jlab.org/pipermail/sbs/attachments/20130628/7a501bdf/attachment.bin
More information about the Sbs
mailing list